Loss of the Bus Output from the FWC2 detected by the DMC3

TASK 31-53-00-810-915-A
Loss of the Bus Output from the FWC2 detected by the DMC3

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 315205
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC

3. Fault Confirmation
Subtask 31-53-00-865-066-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	EIS/FWC2/SPLY	2WW	Q07

Subtask 31-53-00-740-078-A ** ON A/C NOT FOR ALL

B. Test
Do the EIS input test (system 3) AMM 31-60-00-740-002.

Subtask 31-53-00-740-078-B ** ON A/C NOT FOR ALL

B. Test
Do the Ground Scanning Test of the DMC AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 31-53-00-810-164-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
DMC3: NO FWC2 DATA

(1) If the fault continues:

do a check and repair the wiring from FWC2 (1WW2) pins AB/12J, 12K to the first terminal block ASM 315205.

Subtask 31-53-00-810-164-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
FWC2(1WW2) BUSX DATA/DMC3(1WT3)

(1) If the fault continues:

do a check and repair the wiring from FWC2 (1WW2) pins AB/12J, 12K to the first terminal block ASM 315205.

Subtask 31-53-00-740-079-A

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:30:20 UTC